That's what Esme calls Sosi. Is the ú at the end supposed to be gypsy talk?

Esme uses words from different languages, which is fitting her, considering the way her people live and travel all the time. This one, I believe, is Hungarian (or the Gloriana analogue), with the ú just as it appears in the game. Basically, she called Sosi a bastard because of the way he treated her.